吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (1): 178-187.doi: 10.13229/j.cnki.jdxbgxb20210482

• 交通运输工程·土木工程 • 上一篇    

离散元法分析集料接触特性对沥青混合料剪切疲劳寿命的影响

彭勇1(),章秀芳1,郭泽宇1,陆学元2,李彦伟3,4   

  1. 1.浙江大学 交通工程研究所，杭州310058
    2.安徽省交通控股集团有限公司，合肥 230088
    3.河北省交通规划设计院，石家庄 050011
    4.公路建设与养护技术、材料及装备交通运输行业研发中心，石家庄 050011
  • 收稿日期:2021-05-31 出版日期:2023-01-01 发布日期:2023-07-23
  • 作者简介:彭勇（1976-），男，副教授，博士. 研究方向：路面结构与路面材料. E-mail： ypeng@zju.edu.cn
  • 基金资助:
    浙江省自然科学基金项目(LY15E080006)

Influence of aggregate contact characteristics on shear fatigue life of asphalt mixtures using discrete element method

Yong PENG1(),Xiu-fang ZHANG1,Ze-yu GUO1,Xue-yuan LU2,Yan-wei LI3,4   

  1. 1.Institute of Transportation Engineering，Zhejiang University，Hangzhou 310058，China
    2.Anhui Transportation Holding Group Co. ，Ltd. ，Hefei 230088，China
    3.Hebei Provincial Communications Planning and Design Institute，Shijiazhuang 050011，China
    4.Research and Development Center of Transport Industry of Technologies，Materials and Equipments of Highway Construction and Maintenance，Shijiazhuang 050011，China
  • Received:2021-05-31 Online:2023-01-01 Published:2023-07-23

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摘要：

基于CT断层扫描和图像处理采集到的沥青混合料内部结构信息，采用Matlab软件编写程序获取混合料内部集料接触特性，借助颗粒流软件PFC3D建立混合料剪切疲劳试验三维离散元模型，模拟考虑损伤的沥青混合料剪切疲劳寿命，研究集料接触特性对沥青混合料剪切疲劳寿命的影响，并对模拟结果加以试验验证。研究结果表明，考虑疲劳损伤的沥青混合料剪切疲劳三维离散元法可以较好地模拟沥青混合料剪切疲劳试验，得到的剪切疲劳寿命模拟值与试验值误差较小。集料接触点和总接触长度对沥青混合料剪切疲劳寿命影响显著，集料接触点数越多，总接触长度越大，混合料的剪切疲劳寿命越大；水平截面上集料接触方位角对沥青混合料剪切疲劳寿命影响较小，其两者间相关性不明显。此外，集料粒径和空隙率对沥青混合料中集料接触特性有较大的影响。相同的试验条件下，沥青混合料内部集料接触点数和总接触长度随集料粒径的增大而增加，随空隙率的增大而减少。

关键词: 道路工程, 沥青混合料, 集料接触特性, 剪切疲劳寿命, 离散元法

Abstract:

The main purpose of this study is to investigate the influence of aggregate contact characteristics on shear fatigue life of asphalt mixtures using discrete element method （DEM）. On the basis of the internal structure information of asphalt mixtures that was acquired by CT scanning and imaging technology， the aggregate contact characteristics were obtained using a program written in MATLAB. Three-dimensional （3D） discrete element models for the shear fatigue test of asphalt mixtures were established using a DEM code called Particle Flow Code in Three Dimensions （PFC3D） to simulate the shear fatigue life of asphalt mixtures considering fatigue damage. Simulation results were verified by performing laboratory shear fatigue tests. Research results show that the shear fatigue test of asphalt mixtures can be simulated by 3D DEM considering fatigue damage， and a comparison of simulation and laboratory results shows relatively good agreement. Aggregate contact point and contact length significantly influence the shear fatigue life of asphalt mixtures， and the shear fatigue life increases with the increase in aggregate contact point and contact length. The contact orientation of aggregates on the horizontal cross section marginally influences the shear fatigue life， and the correlation between them is not obvious. Furthermore， aggregate size and void content significantly influence the aggregate contact characteristics in asphalt mixtures. Under the same test conditions， the number of aggregate contact points and total aggregate contact length increase with the increase in aggregate size， while decrease with the increase in void content.

Key words: road engineering, asphalt mixture, aggregate contact characteristics, shear fatigue life, discrete element method

中图分类号: 

  • U414

表1

集料级配组成"

级配类型通过下列筛孔（方筛孔，mm）的质量分数/%
26.519.016.013.29.54.752.361.180.60.30.150.075
AC1310094.084.758.625.622.417.512.69.27.0
AC1610093.984.264.940.925.818.515.510.17.86.2
AC2010095.382.970.360.639.018.215.912.38.96.54.9

表2

沥青混合料试件空隙率"

级配类型

油石比

/%

空隙率 /%平均值
1#2#
AC134.92.32.62.5
4.04.34.1
5.15.85.5
AC164.63.83.33.6
AC204.43.93.73.8

图1

重复单轴贯入试验"

表3

沥青混合料集料接触特性"

级配类型油石比/%空隙率/%试件编号接触点数量/个总接触长度/像素接触方位角/（°）
AC134.92.51#7 70369 31845.3
2#7 53868 54044.9
4.11#6 22858 21344.7
2#5 70554 36845.0
5.51#4 43635 06448.4
2#4 27033 22748.5
AC164.63.61#9 04385 00243.7
2#9 53288 94245.8
AC204.43.81#10 70799 42442.9
2#11 667106 08745.9

表4

60 °C 时Burgers模型参数"

级配类型

油石比

/%

麦克斯韦尔模型开尔文模型
E1/MPaη1/（MPa·s）E2/MPa

η2/

（MPa·s）

AC134.90.87109.400.101.54
AC164.60.43112.080.051.18
AC204.40.54115.880.121.72

图2

不同工况下沥青混合料虚拟剪切疲劳试验中变形-加载次数曲线"

表5

沥青混合料剪切疲劳寿命模拟结果"

级配类型

油石比

/%

空隙率

/%

剪切疲劳寿命模拟值/次

平均值

/次

1#2#
AC134.92.511 92511 12311 524
4.17 9317 1227 527
5.54 4993 3973 948
AC164.63.612 72812 97912 854
AC204.43.815 48516 52316 004

图3

接触特性与剪切疲劳寿命模拟值相关性曲线"

图4

不同工况下沥青混合料剪切疲劳试验中变形-加载次数曲线［16］"

表6

沥青混合料剪切疲劳寿命试验结果[16]"

级配类型

油石比

/%

空隙率

/%

剪切疲劳寿命试验值/次

平均值

/次

1#2#
AC134.92.512 01411 06211 538
4.18 0186 5567 287
5.54 6634 0794 371
AC164.63.612 99813 12213 060
AC204.43.815 56216 61416 088
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